Melting pot



March 28, 1939. G. w. TENHHLEl MELTING POT Filed Jan. 18, 1939 INVENTOR eoge W Temple Pamed Mar.28,1939 y 2,1 52,446) .i

UNITED sTATas PATENTor-'Flcs George W. Temple, New York, N. Y., asslgnorto Victor Metal Products Corporation, Brooklyn, N. Y.,l a corporation of New York Application January 18, 1939, Serial No. 251,463

8 clims. (cl. zes- 39)` This invention relates to melting potsand parwhich I'have shown by way of example, and reticularly to those used for melting quantities of ferring particularly to Figs. 1 and 2, the pot I! is comparatively soft metals such as tin, lead, zinc. preferably cast of suitable metal and is provided aluminum and the like. with the downwardly and inwardly inclined side Such melting pots are necessarlly heavy, being walls Il and |2 and with the smilarly inclined 5 usually made of metal, and are often quite large, end walls |3 and Il. Said walls are integraily having a large capacity. During the process of joined at their lower ends by the pot bottom -I 5, melting the large Amass of metal. in the pot, the while at their upper ends, is the hciizontal outmolten metal expands frequently to such an exstanding fiange IS. i

tent that it breaks the melting pot with serious Upstanding centrally of the"bottom il and in resulting dangers and losses. formed integrally therewithis the flue I'Ltermi- I have found that if the mass of metal is heated nating at its upper end II above the top flange more uniformly than has been heretofore posof the pot. The flue surrounds a suitable opensilble, the danger of the pot breaking by reason ingpin the bottom and is provided with a suitable of expansion of the mass of molten metal, is interior passage as' i! communicating with the 15 minimized. opening in the bottom,---for the passage there'- My invention therefore contemplates the prothrough of the hot gases formed by the heating vision of means for applying heat to the central 'means 20. Said heatingv means may take any or other parts of the mass of metal as well as to suitable form but as shown. is made in the form the sides and bottom thereof, thereby heating the of a gas heater arranged close to the bottom IS 20 mass more uniforrnly throughout so that the mass of the pot and designed to heat as large an area also expands more uniformly and does not put an of saidibottom as is possible, as well as to heat undue or breaking stress upon the bottom and the flue i'l.

walls of the' melting pot. .The removable flue cap 2| serves the double My invention further contemplates the provipurpose of preventing'metal `from 'the molten 25 sion of a melting pot adapted to heat the metal mass. 22 from splashing into the vinterior 'ofl the therein at points in spaced relation to the walls flue and reaching the heater 20, and also serves and bottom thereof, and thereby attaining more the function of deflecting the hot gases rising in uniform heating than isotherwise possible. v the flue toward the interiori of the pot and to a My invention further contemplat'es the proviposition over the surface of the molten mass, in 30 sion of a melting pot provided with an upright the pot. The flue cap is of greater diameter than heatin'g flue formed integrally therewith and in the upper end |8 of the flue, therebyrproviding spaced relation to the walls of the-pot, said flueA and annular space 23" between the cap and the being provided with means for preventing splashflue for the downward passage therebetween vof ing of the metal thereinto and for also defiectthe he'ated gases from the i'iue. Preferably, the 35 ing the heated gases emerging from the flue over cap is of generally convex iorm, being provided the surface of the molten metal and thus forming with an inner concave surface 24 of the proper a blanket of gases over the surface to protect the shape to defieot the rising gases through the ansurface from exposure to the atmosphere and nular passage 23 and on to the molten metal sur- 40 from consequent oxidation. face. To remcvably maintain the flue cap in 40 The various objects of the invention will be position on the flue, a. plurality of spacedl capclear fromathe description which follows and from supporting lugs as 25 are provided. Each of said the draw'ing, in which, lugs is provided with a right angle recess 8820,

, Fig. 1 is a top plan view of a melting pot emthe walls of which engage the upper end of the bodying the invention. flue. The arm or projection 21 on the outside of 45 Fig. 2 is a front elevation and partia! Vertical the recess serves to engage the outer surface of section of the same. the flue and to maintain the cap in its proper Fig. 3 is a top plan view of a modified form of position thereon. the invention wherein a number of auxiliary As shown in Fig. 5, the lugs 28 may be substiheating fiues is provided. tuted for the lugs 25, said lugs 22 being provided 50 Fig. 4 is a fragmentary Vertical section through with a recess 2! extending inwardly from the the removable flue cap. outer face thereof and thereby providing a wall, Fig. 5 is a similar view of a somewhat modihed arm or projection 3| engaging the inner face 3| form of the cap. v of the flue and thereby maintaining the can in In the practical embodiment of the invention position. 55

flues are situated at-the properpoints to so heat the mass of metal contained in the potlthat the temperature throughout the mass is as nearly the lsame 4as is possible. lPreferablyi the .iiues are so arranged as to heat all parts of said mass at about.

the same rate.. The number of iiues which -are used is determined by the area and' depth of the pot to which the iluesare applied.

In mat :om of the inventlon mownm mz. 8,

four! flues II, u, Il and 8| are used. One of the fiues 33'. is preferably arranged centrally of the pot, in the same mannerv as the nue ll is arranged in the pot ll. The remaining fiues are spaced preferably, though notnecessarily, substantially midway between the central fiue and, f

the wall I'l of the pot. Each of the flues am provided with a cap 2| as previously described in connection with the ilues ll. The heater -It in this casevmay be of generally circular form with or without a diamtrlcal cross member as 3| thereln to insure adequate heating of the central part of the mass of metal.

It wm be understood that the heaters a ma.

Il not only heat the bottom IS of the pot but also heat the fiue or flues, which in turn heat the surrounding metal. The metal, is, therefore. heated not 'only by'the bottom of the pot but also by 'the ilues, so that more uniform heating of the mass is attained and the differences in temperature of the mass are mlnimized and do not cause undue expansion of the metal and consequent tendency. to break the pot.

It will further be seen that-thegases rising in the fiues are deflected by the caps toward the interlor of the pot to blanket the exposed surface of the molten metal. The blanket of hot t gases serves not only to heat the surface of the metal and henceto obtain still greater uniformity in the temperature of the molten mass, but also serves to protect the surface of the molten metal from contacting. with the 'atmosphere, thereby preventing oxldation vo f the metal 4 and also preventing the formation of an undue amount of scum or dross.

While I have shown and describedcertaln specic embodiments of my inventlon, I do not wish to be understood as limiting myself thereto, but

intend to claim the inventlon as broadly a's may be permitted by the state of the prior art and the 'scope of the appended claims.

I claim:

1. In a melting pot for moltenvmetal, a central' fiue open at both ends and formed integrally a,'1sa,448 I with the bottom of the pot, a removablel cap for the upper end of the fiue. said cap being of greater diameter than said' upper end to provide an annular space therebetween, means on the cap for supportlng the cap on and in spaced relation to the fiue, and a concave under surface on the cap deflecting gases rising in the fiue toward the interior of the pot.

2. In a melting pot for molten metal, a hollow fiue open at both ends, means for heating the pot and theilue, a fiue cap having a concave inner surface and of greater outer diameter than that .of the top ofthe flue, and'means on the cap for removably supporting the cap coaxially of the 'flud and with said inner surface' in outward .spaced relation to 'the top of the fiue.

3. A melting pot for molten metal, said pot.

lhaving side walls Joined by a bottom wall, said bottom wall having an opening therein, a fiue upst'anding from the bottom wall to a point above the top o'f the pot and surrounding the opening, and a gas-diverting`.'cap on and spaced outwardly from the top of the fiue.

4. A melting pot for molten metal, said pot having side walls joined by a bottom wallI said bottom wall having. an opening therein, a fiue upstanding'from the bottom wall to a point above the top. ofv the pot and surrounding the opening,

- and a gas-diverting cap on and spaced outwardly from the top of the fiue, said cap having an inner concave surface of greater outer diameter than that of the top of the fiue and having spaced depending supporting lugs thereon.

5. In a melting pot for molten metal, downwardly and inwardly tapered side walls, a bottom wall joining the lower edges of the side walls and having an opening therein, a hollow ilue 'open at both ends surrounding the opening and upstanding integrally from the bottom wall and of greater height than the side walls, means for heating the bottom wall 4and thefiue, and a cap for the top of 'the fiue preventing the splashing of molten metal intolthe fiue, said cap having an inner concave surface of greater diameter than hot gases for the surface o f the metal in the pot.

6. In a melting pot for molten metal, a plurality of flues each 4upstanding from the bottom wall of the pot and each open at both ends, a

gas-divertlng and protecting cap for each of theflues. and means for heating the bottom wall of the pot and said flues. GEORGE W. TEMPLE. 

